campbell



, A. 0. & 0. H. CAMPBELL.

CYLINDER PRINTING PRESS.

(No Model.)

,478. Patented J11ne13, 1882.

30 the bed to return preparatory to giving the Uivrrno STATES ATENT OFFICE.-

ANDREW CAMPBELL, ANDRE\V C. CAMPBELL, AND CHARLES H. CAMPBELL, OF BROOKLYN, NEYV YORK, ASSIGNORS TO CAMPBELL PRINTING PRESS AND MANUFACTURING COMPANY.

CYLINDER PRINTING-PRESS.

SPECIFICATION forming part of Letters Patent No. 259,478, dated June 13, 1882.

Application filed April 8, 1881. (No model) To all whom it may concern:

Be it known that we, ANDREW CAMPBELL, ANDREW G. CAMPBELL, and GIIAELEs H. CAMPBELL, citizens of the United States, re-

siding at Brooklyn, in the county of Kings and State of New York, have invented a new and useful lmprovcmentin Cylinder Printing- Presses, of which the following is a specification.

This invention relates to that class of printing-presses in which the cylinder makes two revolutions on its axis to each evolution of the. press. In such machines the cylinder necessarily has two distinct motions-first, the uniform revolutions on its axis, and, secondly, the alternate rise and fall of said axis at fixed intervals during each evolution of the press. To obtain these motions, and thereby secure desirable results, various well-known devices are now employed, though in all such machines the bed and cylinder are kept in perfect uniformity of motion through the medium of gearwheels. When the bed and cylinder are in contact, as at the time of giving the impression, said cylinder is down, and in this position the teeth of the cylinder-gear are properly in mesh with those of the pinion below it,and

through which motion is communicated to the bed; but when the cylinder lifts to permit succeeding impression the cylinder-gear and pinion are not properly in mesh, because no means were provided in machines as heretofore constructed whereby the pinion could be 5 raised to compensate for the lift of the cylinder. Therefore thelifting of the cylinder-wheel separates the pitch-lines of these gears and causes a looseness or backlash between the surface of the cylinder and the face of the 0 type-bed, which is an objectionable feature in a printing-press.

The object of this invention is to obviate by simple means this backlash and to secure an accurate relation of motion between the bed and cylinder.

The means by which we obtain these results we will now describe with reference to the accompanying drawings for a fuller and better undcrstandin g of the same.

Figurel shows a fragmentary side elevation of that portion of a printing-press to which our invention particularly belongs. Fig. 2 is a sectional elevation of same, showing, in addition to ourinventiomitsrelation to thosedevices which are common to all presses of this class. Fig. 3 represents, partly in section, a portion of Fig. 2 enlarged for the purpose of showing distinctly that portion of the arrangement which we claim as new. Fig. 4 shows a sectional plan view of Fig. 3.

Similar letters refer to similar parts throughout the several views.

In order that we may more clearly explain our invention,wc have shown the several parts of a printing-press. 6

A represents the impression-cylinder, which is caused to revolve uniformly on its axis.

B is the type-bed, which has a reciprocating motion, and which moves isochronously with the surface of the cylinder A during the interval of printing or on the direct motion of v the bed.

C C are the frames of the machine, wherein arc the longitudinal grooves 11 b, in which the bed B is free to slide. a

M is a cross-stay, which ties frames C C together. I

L is a slotted bracket, secured to the crossstay M, and acts as a support to the oscillating bearing-block V of the shaft Gr.

Secured to the cylinder A at its journal k, and beyond the journal-box d, is the cylinder gear-wheel E, which meshes into a two-faced spur-pinion, F, below it, said pinion being secured to the shaft G. By this combination the rotary motion of the cylinder is transmitted to the shaft G, which in turn communicates a reciprocating motion to the bed B by the intervention of the well-known mangle movement, which movement requires that the 0 shaft Gr shall oscillate vertically to a limited degree while changing the direction of motion of the bed. This limit is clearly represented by the dotted position in Fig. 3.

While the cylinder is down the shaft G is at its lowest position, as shown in Fig. 2, and is driving the bed uniformly with the surface of the cylinder, the motion being communicated through the shaft G and the reversing-pinion O to the rack-hanger H, which is secured rigidly to the under side of the bed. At either end of this rack-han ger well-known devices are used to cause the shaft G to change its line of rotation from its upper or lower limit, and thereby reverse the direction of motion of the bed. The oscillating motion of this shaft is utilized in any desired manner to give the necessary rise and fall to the axis of the cylinder A.

The shaft G is provided with suitable bearings at its ends, wherein it is free to revolve. Its journal S is supported in the yoke N, which yoke has trunnions I I at its ends, whereby it is supported between the stationary brackets K K, the axis of said yoke lying through the axis of shaft G and parallel to the line of motion of bed. Therefore these trunnions form the center from which the shaft G swings in its vertical oscillations. The journal T of this shaft is supported in a rectangular block, V, which slides vertically in the stationary slotted bracket L, which bracket is so constructed as to support the shock of the bed when its motion is reversed, and at the same time permits a free vertical motion to the shaft G and block V.

By reference to Fig. 3 it will be seen that the two-faced pinion F engages its inclined facesf and f (which faces are a counterpart of one another) alternately with that of the cylinder-wheel E. The position of parts herein represented is opposite from that shown in Fig. 2, though the dotted position shows the other extreme of motion or that corresponding to Fig. 2.

If the center of oscillation of the shaft G were to be located, as in all machines heretofore constructed, directly in the plane of center of cylinder-wheels face, as on the line .00 00, Figs. 2, 3, and 4, the oscillatory motion of the shaft G could have no other effect on the working position of the two-faced pinion F than to present alternately its faces f and f to the cylinder-wheel E. Therefore the raising of the cylinder would leave an intervening space between the pitch-line of one or the other of the faces of the pinion F and the pitch-line of the cylinder-wheel E, which, as we have hereinbefore stated, would give rise to an objectionable backlash. To prevent this, and with a view to securing a more quiet running mechanism, we

have placed the center of oscillation of the shaft G outside or beyond the center line, or w, as shown at I, Fig. 3, so that while the shaft changes from its upper to its lower limit of oscillation, or vice versa, the pitch-lines of the wheels E and F are kept in perfect working contact. When the cylinder rises the rising of the shaft causes the pinion F to follow up the cylinder-wheel while presenting its opposite face to be operated upon by said cylinderwheel. The exact location of this center of oscillation is dependent on the rise and fall of the cylinder-axis and the relation of such motion to that of the rise and fall of shaft G. We have preferred to locate this center outside or beyond the two'faced pinion F, though the same result could be obtained by placing the center inside of the pinion F, or between said pinion and the reversing-pinion O, the only difference in the operation being that in this last construction the shaft G would be revolving in its upper limit of oscillation while the cylinder was down, or vice versa.

WVe are aware that the mechanical devices herein described for driving the bed and cylinder ot' a printing-press are not new per se, and we do not claim broadly a combination of such devices for such purposes; but,

As of our invention, we claim- In a cylinder printing-press, in combination with a gear-wheel attached to the impressioncylinder, constructed and adapted to be raised and lowered at. altern ate revolutions, a doublefaced pinion mounted on an oscillating and r0- tary shaft whose point of oscillation lies without a plane equally dividing the face of the gear-wheel, whereby the teeth on each face of said pinion are caused to follow and alternately engage at a constant depth of engagement with the teeth of said gear-wheel in the raised and lowered positions of the cylinder in the operation of printing a sheet, substantially as set forth.

A. CAMPBELL.

ANDREW C. CAMPBELL. [L. s.]

CHAS. H. CAMPBELL. [L. s] Witnesses:

L. H. VINCENT,

F. \V. HURD,

J. R. CAMPBELL.

Witness for C. H. C.:

SoU'rHRIcK E. HEBBERD. 

